<template>
  <div class="sidebar">
    <el-menu
      class="sidebar-el-menu"
      :default-active="onRoutes"
      :collapse="collapse"
      background-color="#334256"
      text-color="#ffffff"
      ctive-text-color="#20a0ff"
      router
    >
      <template v-for="item in items">
        <template>
          <el-menu-item :index="item.index" :key="item.index">
            <i :class="item.icon"></i>
            {{item.title}}
          </el-menu-item>
        </template>
      </template>

    </el-menu>
  </div>
</template>

<script>
import bus from "../assets/js/bus"
export default {
  data(){
    return{
      collapse: false,
      items: [
        {
          icon: 'el-icon-document',
          index: 'Singer',
          title: '歌手管理'
        },
        // {
        //  icon: 'el-icon-document',
        //  index: 'SongList',
        //  title: '榜单管理'
        // }
        {
          icon: 'el-icon-document',
          index: 'Rank',
          title: '榜单管理'
        }
      ]
    }
  },
  computed:{
    onRoutes(){
      return this.$route.path.replace('/','');
    }
  },
  created(){
    //通过Bus进行组件间的通信，来折叠侧边栏
    bus.$on('collapse',msg =>{
      this.collapse = msg
    })
  }
}
</script>

<style scoped>
.sidebar {
  display: block;
  position: absolute;
  left: 0;
  top: 70px;
  bottom: 0;
  background-color: #334256;
  overflow-y: scroll;
}

.sidebar::-webkit-scrollbar{
  width: 0;
}

.sidebar-el-menu:not(.el-menu--collapse){
  width: 150px;
}

.sidebar >ul {
  height: 100%;
}
</style>
